How to Reset SSH Host Keys When Deploying Linux Templates in Proxmox

This course demonstrates how to create Ubuntu templates in Proxmox that generate unique SSH host keys for each cloned instance. It covers machine ID resets, host-key files, permissions, systemd configuration, rebooting, and verification.

Syllabus

Introduction
Creating a VM in Proxmox
Installing Ubuntu Server
Resetting the Machine ID
Demonstrating the Wrong Way to go About This
Connecting to our VMs
Locating the Host Keys
What’s in a Host Key File?
Demonstrating the Right Way to go About This
Connecting to Our New VMs
Resetting the Machine ID
Creating a Template with Unique Host Keys
What’s In This Code?
Change File Permissions
Move the File
Restart systemd
Enable regenerate_ssh_host_keys.service
Checking the Key Before Regeneration
Reboot the System
Creating a Template in Proxmox
Clone the VM
Check the New Servers Keys
Conclusion